Итоги голосования для комментария:
InfernalPenguin creativecommons.org/licenses/

В конкретном случае Fate:
For our alternative open license option, we will be making use of the Creative Commons Attribution (CC-BY) license. Use of this license will simply require that you make a clear statement (we’ll give you the text) that your game is based on our material. Unlike some other Creative Commons options, this is not “viral”—you don’t have to make your derived content open at all.
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